package/pkg-kconfig: move defaults before calling pkg-generic

package/pkg-kconfig: move defaults before calling pkg-generic

Currently, we define the default values for kconfig-specific variables
after we call into the generic package infrastructure.

So far, this was totally unconsequential, because there was no kconfig
variable that could influence the generic parts. But conversely, there
are generic variables that do influence the kconfig part (e.g. $(2)_DIR
that is used in some dependency definitions), but none that do influence
the kconfig variables.

However, we are going to add a new kconfig-related variable that will
have an impact on the generic parts, so we will want that kconfig
variable to be defined before calling into the generic infrastructure.

For consistency, move all the defaults before calling the generic infra.

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Thomas De Schampheleire <patrickdepinguin@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>